This WSP Constructing & Scratchbuilding Realistic Coal Wagons book describes best-practice when constructing or scratch-building such models in 4mm scale.
CONSTRUCTING & SCRATCHBUILDING REALISTIC PASSENGER COACHES IN 4mm SCALE BOOK
CONSTRUCTING & SCRATCHBUILDING REALISTIC COAL WAGONS IN 4mm SCALE BOOK
CONSTRUCTING/SCRATCHBUILDING GENERAL/SPECIAL VANS & TANK WAGONsIN 4mm SCALE BOOK
